Seat spring cushion of the air cushion type



March 9, 1954 M. STUBNITZ 2,671,498

SEAT SPRING CUSHION OF. THE AIR CUSHION TYPE Filed May 15, 1951 2Sheets-Sheet l INVENTQR.

Mag/"ice Stub/7M5 ATTOR/VEKS.

arch 1954 M. STUBNITZ SEAT SPRING CUSHION OF THE AIR CUSHION TYPE FiledMay 15, 1951 2 Sheets-Sheet 2 INVENTQR. I Maurice Stub/Hi3 ATTORNEYSPatented Mar. 9, 1954 SEAT SPRING CUSHION OF THE AIR CUSHION TYPEMaurice Stubnitz, Adrian, Mich., assignor to Stubnitz-Greene SpringCorporation, Adrian, Mich, a corporation of Michigan Application May 15,1951, Serial No. 226,399

8 Claims. 1

This invention relates to spring seat cushions of the air cushion type.A seat spring cushion of this type is shown, described and claimed in myprior Patent No. 2,031,745.

It is the object of the present invention to provide an improved seatspring cushion of this type in which the assembly of the bottom plate ismade with the bottom frame by means of the spring stringers or wirebeams that support the upper coil spring structure.

Another feature of my improvement is that the bottom frame carrieslacing pins or hooks over which the upholstering cover may be stretchedand held in place by a draw string passing over the hooks and througheyes in the turned over skirt of the upholstering.

Referring to the drawings:

Fig. 1 is a plan View of the seat cushion with a part of theupholstering broken away to show the spring structure.

Fig. 2 is a section taken on the line 2-2 of Fig. 1.

Fig. 3 is a detail showing the coil spring construction with the crossedstringers.

Fig. 4 is a detail enlarged view showing how the spring stringers orbeams are hooked into holes in the diaphragm and the bottom frame andthen turned up into vertical position.

Fig. 5 is a cross section taken on the line 55 of Fig. 1.

Fig. 6 is an elevational view of the bottom of the seat cushion.

The spring cushion of the type shown in my prior Patent 2,031,745operates on the principle of using spring resistance and also airresistance to carry the load. The air resistance is of the dash pottype. The air in the spring of 2,031,745 is allowed to escape along theedge of the bottom plate or diaphragm and the diaphragm is alsoperforated. In the present spring construction, I provide a channel orpreferably a J frame I at the bottom. This has a large flange 2 on whichrests the diaphragm 3 usually made of paper board. This may have aventilating opening 4 through which the air is expelled when the loadtakes effect on the cushion.

In my prior application, Serial No. 45,175, filed August 19, 1948, nowPatent No. 2,642,929 I have described and claimed a seat spring withabbreviated length coiled load supporting springs which are supported onspring wire beams or stringers. These stringers or spring beams aredesignated 5 in the present application. To assemble my present aircushion spring, I provide the jack springs or safety pin type of springsat 2 the ends of the spring beams with hooks 6 on their ends. Thesehooks are part of a shallow S-shaped leg 1. The hooks are passed downthrough the perforations 8 in the diaphragm 3 and perforations 9 in theflange or stem of the J strip. These perforations register, as shown inFig. 4. The stringers may be turned down to horizontal position, theS-shaped leg with its hook is passed down through the registeringperforations, then the stringer is turned up to the vertical position asshown by the full lines. The upper bar of the S-shaped leg forms a restfor the stringer on the diaphragm above the flange of the border frame.When the several stringers are turned up to the vertical position asshown in the full lines of Fig. 4, then the cross stringers It) may belaid over the spring stringers. These cross stringers II] have bumped upportions H which lie in the depressions I2 in the spring stringers asshown in Figs. 2 and 5. This arrangement locates the cross stringersproperly with respect to the spring stringers. Then the abbreviated ortruncated hour glass type of load supporting springs I3 may be screwedin place as shown in Fig. 3 and as described in the application ofHarlan L. Davis, Serial No. 139,214, filed January 18, 1950-, which hasbecome abandoned. The spring is turned or screwed over the left handportion of the cross stringer l0, then under the right hand portion ofthe spring stringer 5, and then the bumped up portion M of the end ofthe coil comes to rest on the top of the right hand portion of the crossstringer I0, being guided over the cross stringer by means of the turnedup end [5 of the coil. All the springs are thus easily screwed intoposition. Then the short coil tractile springs it are hooked over thetop whorls of the spring to connect them together at the top. The wiretop frame I! is clipped to the top whorls of the load supportingsprings.

The upholstering mat I 8 is laid over the top of the coiled loadsupporting springs and then the trimming or upholstering cover I9 isstretched over the mat and the skirt 20 extends down on all sides andthe turned over edge material 2| is provided with eyes 22 through whichpasses the drawstring 23 and this drawstring is looped or laced over thehooks 24 which are welded to the large top flange of the J frame or rimmember. This easily and simply assembles the trim material over the seatcushion and provides a fairly good air seal to hold the air in theinside of the cushion to be expelled only through the center opening 4on the dash pot principle. The

stringers will not tip over, because these stringers are all tiedtogether by the cross wires Ill which are firmly anchored to the ends ofthe supporting conical springs, and the supporting springs are tied tothe top frames and to one another.

What I claim is:

1. A seat spring cushion assembly to which is to be applied anupholstering cover over the top, sides and rim of the seat spring toform a combined air cushion and spring seat having in combination, a topframe, a bottom frame provided with perforations, a diaphragm providedwith perforations registering with the perforations of the bottom frame,said diaphragm resting onthe top of the bottom frame and provided withan air release to provide a dash pot action for the cushion, springstringers with jack springs at their ends hooked through saidregistering perforations in the bottom frame member and the diaphragm,cross stringers laid over the spring stringers, and short coil springsanchored to the cross stringers at the crossing and secured at theirtops to the top frame member and to each ther.

2. The combination claimed in claim 1 in which the cross stringers arefloating wire members having their ends completely free of the twoframes.

3. The combination claimed in claim 1 in which the cross stringers havebumped up portions and the spring stringershave depressed portions forlocating the cross stringers properly with respect to the wire stringersand in which the short coil springs are screwed over and under thecrossed wires at their intersections.

4. The combination claimed in claim 1 in which the bottom frame isJ-shaped in cross section with the stem of the J in the upper position,upon which the diaphragm is supported by means of hooking the jackspring ends of the spring stringers in the registering perforations ofthe diaphragm and the stem of the J.

5. The combination claimed in claim 4 in which lacing pins or hooks arewelded to the underside of the long stem of the J.

6. The combination claimed in claim 4 in which the hooked in ends of thejack springs are S- shaped legs.

7. A seat cushion having in combination a seat spring comprising anupper frame, a lower frame, crossed stringers, coiled springs supportedupon the stringers, and with some of the stringers and springsconnecting the upper and lower frames, lacing pins welded to the lowerframe, an upholstering cover fitted over the top and all the sides ofthe cushion assembl with the skirts turned under and provided with aplurality of eyes in the turned under skirt portion, and a drawstringthreaded through the eyes and looped over the lacing pins to completethe assembly of the upholstering to the seat spring.

8. The combination claimed in, claim 7 in which the lower frame is a Jsection with a flange and a perforated diaphragm or bottom plate havingits edges supported on the stem of the J to form an air cushion.

MAURICE STUBNITZ.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 813,923 Staples Feb. 27, 1906 977,566 Sorey Dec. 6, 19101,051,466 Travis Jan. 28, 1913 2,125,519 Oldham Aug. 2, 1938 2,222,052Vanderploeg Nov. 19, 1940 FOREIGN PATENTS Number Country Date 228,253Great Britain Jan. 30, 1925

